Yokolos LS Throttle-Body Bypass Hose Kit for GM LS Engines — Cast-Steel Fittings & Stainless-Braided Hose

Yokolos LS Throttle Body Bypass Hose Kit is a complete coolant/steam crossover assembly that replaces factory plumbing to reliably route coolant between LS-series throttle bodies and intake ports.

Designed for GM LS engines, this kit provides hardened cast-steel fittings, stainless-braided hose, and hardware to repair or upgrade the throttle-body coolant circuit. It eliminates corroded or leaking original parts, simplifies installation with included orings and bolts, and uses tapered pipe threads that accept pipe sealant for a secure fit.

How does this kit improve coolant routing on LS engines?

The Yokolos kit replaces aging or damaged throttle-body plumbing with robust metal fittings and a braided hose that resists heat, kinking, and abrasion. By restoring a tight coolant path you reduce the chance of leaks, steam buildup, and coolant loss around the intake manifold and throttle body.

• Includes two machined coolant ports sized for LS throttle body passages.
• Braided hose withstands engine bay temperatures and routing stress.
• Two orings and three bolts provided to seal and fasten the assembly.
• Tapered threads require pipe sealant for pressure-tight connections.

What components come with the Yokolos crossover hose kit?

The package contains cast-steel ports, a pre-measured steel-braided hose, two sealing orings, and three mounting bolts — everything needed to replace the common throttle-body crossover plumbing. Hardware and fittings are made to resist rust and long-term exposure to coolant.

• Two cast-steel coolant ports with corrosion-resistant finish.
• One steel-braided hose sized for LS coolant flow and routing clearance.
• Two high-quality orings and three installation bolts for secure assembly.
• Threaded ends use tapered pipe threads; apply sealant before installation.

Will this fit my GM LS-series engine and how difficult is installation?

The kit is compatible with all GM LS-series engines that use throttle-body coolant passages. Installation is typically straightforward for do-it-yourselfers comfortable with basic engine work, but you should read fitment details and use pipe sealant on tapered threads for a leak-free finish.

• Designed to match OEM throttle-body coolant port spacing on LS engines.
• No special tools required beyond common hand tools and thread sealant.
• Replacement reduces future maintenance from corroded factory fittings.
• Follow torque specs for bolts and allow sealant cure time before pressurizing.

This Yokolos crossover hose kit is built from heavy-duty cast steel and stainless-braided hose to withstand the heat and chemical exposure found in engine compartments. The materials provide impact and corrosion resistance for reliable long-term service, and the supplied orings and bolts simplify the swap.

Who is this for? Mechanics, LS engine owners, and performance restorers who need a durable, ready-to-install throttle body coolant bypass solution will benefit most. It’s especially useful if factory hoses or fittings are corroded, leaking, or missing, or when upgrading to a more robust coolant plumbing layout in a high-mileage or modified LS-powered vehicle.